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6dbe3af9 | 1 | /* |
726f69e2 KZ |
2 | * Copyright (c) 1987, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
4 | * (c) UNIX System Laboratories, Inc. | |
5 | * All or some portions of this file are derived from material licensed | |
6 | * to the University of California by American Telephone and Telegraph | |
7 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with | |
8 | * the permission of UNIX System Laboratories, Inc. | |
6dbe3af9 | 9 | * |
726f69e2 KZ |
10 | * Redistribution and use in source and binary forms, with or without |
11 | * modification, are permitted provided that the following conditions | |
12 | * are met: | |
13 | * 1. Redistributions of source code must retain the above copyright | |
14 | * notice, this list of conditions and the following disclaimer. | |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in the | |
17 | * documentation and/or other materials provided with the distribution. | |
18 | * 3. All advertising materials mentioning features or use of this software | |
19 | * must display the following acknowledgement: | |
20 | * This product includes software developed by the University of | |
21 | * California, Berkeley and its contributors. | |
22 | * 4. Neither the name of the University nor the names of its contributors | |
23 | * may be used to endorse or promote products derived from this software | |
24 | * without specific prior written permission. | |
25 | * | |
26 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
27 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
30 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
32 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
33 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
34 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
35 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
36 | * SUCH DAMAGE. | |
37 | * | |
38 | * Modified Fri Mar 10 20:27:19 1995, faith@cs.unc.edu, for Linux | |
fd6b7a7f KZ |
39 | * Modified Mon Jul 1 18:14:10 1996, janl@ifi.uio.no, writing to stdout |
40 | * as suggested by Michael Meskes <meskes@Informatik.RWTH-Aachen.DE> | |
7eda085c | 41 | * |
b50945d4 | 42 | * 1999-02-22 Arkadiusz MiĆkiewicz <misiek@pld.ORG.PL> |
7eda085c KZ |
43 | * - added Native Language Support |
44 | * | |
1a68fc8a MP |
45 | * 2010-12-01 Marek Polacek <mmpolacek@gmail.com> |
46 | * - cleanups | |
6dbe3af9 | 47 | */ |
726f69e2 | 48 | |
6dbe3af9 | 49 | #include <errno.h> |
726f69e2 KZ |
50 | #include <stdio.h> |
51 | #include <stdlib.h> | |
52 | #include <string.h> | |
6dbe3af9 | 53 | #include <unistd.h> |
1a68fc8a MP |
54 | #include <sys/types.h> |
55 | #include <sys/stat.h> | |
fe16e125 | 56 | #include <getopt.h> |
cdd2a8c3 SK |
57 | |
58 | #include "closestream.h" | |
7eda085c | 59 | #include "nls.h" |
eb76ca98 | 60 | #include "c.h" |
51924a4e | 61 | #include "rpmatch.h" |
6dbe3af9 | 62 | |
5eae5930 FC |
63 | /* exit codes */ |
64 | ||
65 | #define IS_ALLOWED 0 /* Receiving messages is allowed. */ | |
66 | #define IS_NOT_ALLOWED 1 /* Receiving messages is not allowed. */ | |
67 | #define MESG_EXIT_FAILURE 2 /* An error occurred. */ | |
68 | ||
fe16e125 SK |
69 | static void __attribute__ ((__noreturn__)) usage(FILE * out) |
70 | { | |
1e6f6cdb | 71 | fputs(USAGE_HEADER, out); |
041b8ab2 SK |
72 | /* TRANSLATORS: this program uses for y and n rpmatch(3), |
73 | * which means they can be translated. */ | |
fe16e125 | 74 | fprintf(out, |
2960a4a3 | 75 | _(" %s [options] [y | n]\n"), program_invocation_short_name); |
451dbcfa BS |
76 | |
77 | fputs(USAGE_SEPARATOR, out); | |
78 | fputs(_("Control write access of other users to your terminal.\n"), out); | |
79 | ||
1e6f6cdb SK |
80 | fputs(USAGE_OPTIONS, out); |
81 | fputs(_(" -v, --verbose explain what is being done\n"), out); | |
82 | fputs(USAGE_HELP, out); | |
83 | fputs(USAGE_VERSION, out); | |
84 | fprintf(out, USAGE_MAN_TAIL("mesg(1)")); | |
fe16e125 SK |
85 | |
86 | exit(out == stderr ? MESG_EXIT_FAILURE : EXIT_SUCCESS); | |
87 | } | |
88 | ||
1a68fc8a | 89 | int main(int argc, char *argv[]) |
6dbe3af9 | 90 | { |
726f69e2 KZ |
91 | struct stat sb; |
92 | char *tty; | |
010d5a67 | 93 | int ch, fd, verbose = FALSE, ret; |
726f69e2 | 94 | |
fe16e125 | 95 | static const struct option longopts[] = { |
849c6ea3 | 96 | { "verbose", no_argument, 0, 'v' }, |
fe16e125 SK |
97 | { "version", no_argument, 0, 'V' }, |
98 | { "help", no_argument, 0, 'h' }, | |
99 | { NULL, 0, 0, 0 } | |
100 | }; | |
101 | ||
5d324c6b SK |
102 | setlocale(LC_ALL, ""); |
103 | bindtextdomain(PACKAGE, LOCALEDIR); | |
104 | textdomain(PACKAGE); | |
105 | atexit(close_stdout); | |
106 | ||
849c6ea3 | 107 | while ((ch = getopt_long(argc, argv, "vVh", longopts, NULL)) != -1) |
726f69e2 | 108 | switch (ch) { |
849c6ea3 SK |
109 | case 'v': |
110 | verbose = TRUE; | |
111 | break; | |
fe16e125 | 112 | case 'V': |
1e6f6cdb | 113 | printf(UTIL_LINUX_VERSION); |
fe16e125 SK |
114 | exit(EXIT_SUCCESS); |
115 | case 'h': | |
116 | usage(stdout); | |
726f69e2 | 117 | default: |
fe16e125 | 118 | usage(stderr); |
726f69e2 | 119 | } |
1a68fc8a | 120 | |
726f69e2 KZ |
121 | argc -= optind; |
122 | argv += optind; | |
123 | ||
124 | if ((tty = ttyname(STDERR_FILENO)) == NULL) | |
5eae5930 | 125 | err(MESG_EXIT_FAILURE, _("ttyname failed")); |
010d5a67 SK |
126 | if ((fd = open(tty, O_RDONLY)) < 0) |
127 | err(MESG_EXIT_FAILURE, _("cannot open %s"), tty); | |
128 | if (fstat(fd, &sb)) | |
fc14ceba | 129 | err(MESG_EXIT_FAILURE, _("stat of %s failed"), tty); |
726f69e2 | 130 | |
1a68fc8a | 131 | if (!*argv) { |
010d5a67 | 132 | close(fd); |
726f69e2 | 133 | if (sb.st_mode & (S_IWGRP | S_IWOTH)) { |
1a68fc8a | 134 | puts(_("is y")); |
5eae5930 | 135 | return IS_ALLOWED; |
726f69e2 | 136 | } |
1a68fc8a | 137 | puts(_("is n")); |
5eae5930 | 138 | return IS_NOT_ALLOWED; |
726f69e2 KZ |
139 | } |
140 | ||
041b8ab2 | 141 | switch (rpmatch(argv[0])) { |
cd2a6f1c | 142 | case RPMATCH_YES: |
726f69e2 | 143 | #ifdef USE_TTY_GROUP |
010d5a67 | 144 | if (fchmod(fd, sb.st_mode | S_IWGRP) < 0) |
726f69e2 | 145 | #else |
010d5a67 | 146 | if (fchmod(fd, sb.st_mode | S_IWGRP | S_IWOTH) < 0) |
726f69e2 | 147 | #endif |
5eae5930 | 148 | err(MESG_EXIT_FAILURE, _("change %s mode failed"), tty); |
849c6ea3 SK |
149 | if (verbose) |
150 | puts(_("write access to your terminal is allowed")); | |
010d5a67 SK |
151 | ret = IS_ALLOWED; |
152 | break; | |
cd2a6f1c | 153 | case RPMATCH_NO: |
010d5a67 | 154 | if (fchmod(fd, sb.st_mode & ~(S_IWGRP|S_IWOTH)) < 0) |
5eae5930 | 155 | err(MESG_EXIT_FAILURE, _("change %s mode failed"), tty); |
849c6ea3 SK |
156 | if (verbose) |
157 | puts(_("write access to your terminal is denied")); | |
010d5a67 SK |
158 | ret = IS_NOT_ALLOWED; |
159 | break; | |
cd2a6f1c | 160 | case RPMATCH_INVALID: |
041b8ab2 | 161 | warnx(_("invalid argument: %s"), argv[0]); |
fe16e125 | 162 | usage(stderr); |
041b8ab2 SK |
163 | default: |
164 | abort(); | |
726f69e2 | 165 | } |
010d5a67 SK |
166 | close(fd); |
167 | return ret; | |
6dbe3af9 | 168 | } |